The eigenvalue problem y(4)(¸; x) ¡ (gy0)0(¸; x) = ¸2y(¸; x) with boundary conditions
y(¸; 0) = 0;
y00(¸; 0) = 0;
y(¸; a) = 0;
y00(¸; a) + i®¸y0(¸; a) = 0;
where g 2 C1[0; a] is a real valued function and ® > 0, has ...
We consider on the interval [0; a], rstly fourth-order di erential operators with eigenvalue
parameter dependent boundary conditions and secondly a sixth-order di erential operator
with eigenvalue parameter dependent ...